Coherent stacking of picosecond laser pulses in a high-Q optical cavity for accelerator applications

• Main Authors: Androsov, V.P., Karnaukhov, I.M., Telegin, Y.N.
• Format: Article
• Language: English
• Published: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2007
• Series: Вопросы атомной науки и техники
• Subjects: Теория и техника ускорения частиц
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/110567

We have performed the harmonic analysis of the steady-state coherent pulse-stacking process in a high-Q Fabry-Perot cavity. The expression for the stacked pulse shape is obtained as a function of both the laser cavity and pulse-stacking cavity parameters. We have also estimated the pulse power gains attainable in the laser-optical system of NESTOR storage ring, which is under development at Kharkov Institute of Physics and Technology. It is shown that high power gains (~10⁴) can be, in principle, achieved in a cavity, formed with low-absorption, high reflectivity (R ~ 0.9999) mirrors, if the laser cavity length will differ exactly by half wavelength from the pulse-stacking cavity length. It implies development of the sophisticated frequency stabilization loop for maintaining the cavity length constant within a sub-nanometer range. At the same time, power gains of ~10³ can be obtained with medium reflectivity mirrors (R ~ 0.999) at considerably lower cost.